and find the aarp medicare supplement plan that may be right for you. >>> well, a disturbing new survey shows that pork contains a high level of bacteria that causes food poisoning. >> researchers from consumer reports tested samples from supermarkets in six cities. abc's dr. richard besser tells us exactly what they found. >> reporter: you don't know its name, but you may be one of the 100,000 americans who get sick each year from a bacteria. and the study explains why. consumer reports tested pork, the type you buy in the supermarket. pork chops, ground pork. they found that 70% of the samples they tested hat yersinia on them. ground pork turned out to be more risky than pork chops. >> this should be a wake-up call to the american public. what are we doing in terms of monitoring the safety of pork and what can we do in the future. >> reporter: this bacteria can hit hard. in a matter of days you experience fever, cramps, bloody diarrhea that may last for weeks, especially common in children. cooking the pork thoroughly does kill the backterbacteria, bu